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time: update docs to clarify goroutine-safety expectations of Time

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Fixes #19935

Change-Id: I28e4cd6924f1b965a429a6a5ebfc4c0f952e8ae6
Reviewed-on: https://go-review.googlesource.com/40390
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
This commit is contained in:
Nicholas Maniscalco 2017-04-11 13:27:41 -07:00 committed by Brad Fitzpatrick
parent 5dbdd79816
commit 4aa5d2eede
1 changed files with 5 additions and 2 deletions
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7
src/time/time.go
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@ -81,8 +81,11 @@ import "errors"
//
// Programs using times should typically store and pass them as values,
// not pointers. That is, time variables and struct fields should be of
// type time.Time, not *time.Time. A Time value can be used by
// multiple goroutines simultaneously.
// type time.Time, not *time.Time.
//
// A Time value can be used by multiple goroutines simultaneously except
// that the methods GobDecode, UnmarshalBinary, UnmarshalJSON and
// UnmarshalText are not concurrency-safe.
//
// Time instants can be compared using the Before, After, and Equal methods.
// The Sub method subtracts two instants, producing a Duration.